种用于背光模块的光学复合片 Optical composite sheet for backlight module
本申请要求 2010年 4月 23日提交中国专利局、 申请号为 201010160651. 9, 发明名称为 "一种用于背光模块的光学复合片" 的中国专利申请的优先权, 其全部内容通过引用结合在本申请中。 The present application claims priority to Chinese Patent Application No. 201010160651. filed on Apr. 23, 2010, the entire disclosure of which is incorporated herein by reference. In this application.
技术领域 Technical field
本发明涉及液晶显示器领域, 尤其涉及一种用于背光模块的光学复合片。 背景技术 The present invention relates to the field of liquid crystal displays, and more particularly to an optical composite sheet for a backlight module. Background technique
一般而言, 为提高不仅包括电子发光板、 笔记本电脑显示器、 文字处理 器、 台式计算机显示器、 电视、 摄像机, 而且还包括汽车及飞机显示器在内 的液晶显示装置(Liquid Crystal Display, LCD)等背面照明平板显示器的亮 度, 采用各种结构的背光模块, 该背光模块具备光源、 导光板及多个光学片, 来自光源的光通过导光板及多个光学片之后出射至显示器。 In general, in order to improve the back surface of liquid crystal displays (LCDs) including not only electronic illuminating panels, notebook computers, word processors, desktop computer monitors, televisions, video cameras, but also automotive and aircraft displays. For the brightness of the flat panel display, a backlight module of various structures is provided. The backlight module includes a light source, a light guide plate and a plurality of optical sheets, and the light from the light source passes through the light guide plate and the plurality of optical sheets and then exits to the display.
最近, 为了提高 LCD等图像显示装置的亮度和可视角度的特性, 在背光模 块中使用各种形式的光学片。 在上述光学片中, 为提高光的特性需要使用各 种形式光学片, 而上述光学片分为聚光用光学片和扩散用光学片。 若使用聚 光用光学片, 则虽提高亮度, 但随可视角度的变化亮度特性变化较大, 从而 降低可视角度特性, 而若使用扩散用光学片, 则虽提高可视角度特性, 但会 降低亮度。 Recently, in order to improve the characteristics of brightness and viewing angle of an image display device such as an LCD, various forms of optical sheets are used in a backlight module. In the above optical sheet, it is necessary to use various types of optical sheets for improving the characteristics of light, and the optical sheets are classified into a light collecting optical sheet and a diffusing optical sheet. When the optical sheet for collecting light is used, although the brightness is increased, the brightness characteristic changes greatly depending on the viewing angle, and the viewing angle characteristics are lowered. When the optical sheet for diffusion is used, the viewing angle characteristics are improved. Will reduce the brightness.
因此, 对兼备聚光作用和扩散作用的光学复合片, 进行了各种研究和开 发。 Therefore, various research and development have been carried out on optical composite sheets having both a collecting effect and a diffusing action.
图 1为现有背光模块概略示意图。 如图 1所示, 背光模块包括: 光源 4; 导
光板 5, 用于改变从上述光源 4出射光的路径, 以导引至显示部 (未图示); 多 个光学片 6、 7、 8, 设置于上述导光板 5和显示部(未图示)之间, 用以提高从 上述导光板 5出射光的效率; 反射板 2, 为防止从上述光源 4产生的光暴露至外 部而设置于上述导光板 5下部; 光源反射板 3 ; 模架 1 ; 而且, 在上述模架 1上 依次层叠反射板 2、 光源反射板 3、 导光板 5及光学片 6、 7、 8而成。 FIG. 1 is a schematic diagram of a conventional backlight module. As shown in FIG. 1, the backlight module includes: a light source 4; The light plate 5 is configured to change a path of the light emitted from the light source 4 to be guided to a display portion (not shown); and the plurality of optical sheets 6, 7, and 8 are disposed on the light guide plate 5 and the display portion (not shown) Between the two, to improve the efficiency of the light emitted from the light guide plate 5; the reflector 2, in order to prevent the light generated from the light source 4 from being exposed to the outside is provided in the lower portion of the light guide plate 5; the light source reflector 3; the mold frame 1 Further, a reflection plate 2, a light source reflection plate 3, a light guide plate 5, and optical sheets 6, 7, and 8 are laminated on the mold frame 1 in this order.
在制造过程中, 光学片 6、 7、 8可由扩散片 6、 棱镜片 7及保护片 8构成。 为提高聚光效率, 棱镜片 7的结构化图形 9具有三角形剖面, 而对形成顶角的 结构化图形 9的尖端部形状, 进行各种变化, 而具有 90 ° 顶角的结构化图形 9 公认能够提供最好的亮度。 上述扩散片 6的作用在于扩散从上述导光板 5出射 并入射至显示部 (未图示)的光, 以使光的亮度分布变得均匀。 In the manufacturing process, the optical sheets 6, 7, 8 may be composed of a diffusion sheet 6, a prism sheet 7, and a protective sheet 8. In order to improve the light collecting efficiency, the structured pattern 9 of the prism sheet 7 has a triangular cross section, and various changes are made to the shape of the tip end portion of the structured pattern 9 forming the vertex angle, and the structured pattern having a 90 ° apex angle is recognized. Can provide the best brightness. The diffusion sheet 6 functions to diffuse light that is emitted from the light guide plate 5 and incident on a display portion (not shown) to uniformize the luminance distribution of light.
为兼备聚光功能和扩散功能, 背光模块用光学复合片制作成包括形成于 单一基材层上部的微细结构化图形和形成于基材层下部的扩散图形的一体型 光学片。 In order to have both a condensing function and a diffusing function, the backlight module is formed of an optical composite sheet comprising an integrated optical sheet including a finely structured pattern formed on the upper portion of the single substrate layer and a diffusion pattern formed on the lower portion of the substrate layer.
光学复合片根据背光模块所要求的配置, 可设置于导光板 5上部, 也可附 着于棱镜片 7上部。 The optical composite sheet may be disposed on the upper portion of the light guide plate 5 or attached to the upper portion of the prism sheet 7 according to the configuration required of the backlight module.
图 2为现有光学复合片一实施例剖面图, 通常光学复合片 10包括为聚光而 形成于基材层 11上部的三角形结构化图形 12和为光的扩散而形成于基材层 11 下部的珠子 14。 2 is a cross-sectional view showing an embodiment of a conventional optical composite sheet. The optical composite sheet 10 includes a triangular structured pattern 12 formed on the upper portion of the base material layer 11 for collecting light, and a lower portion of the base material layer 11 formed for diffusion of light. Beads 14.
因此, 形成于基材层 11下部的珠子 14将从外部入射的光收敛至三角形结 构的结构化图形 12之前, 起到扩散上述光的作用。 例如, 上述光学复合片 10 应用于背光模块时, 从导光板 5出射的光无需通过另外的扩散片 6, 而是通过 珠子 14进行扩散。 Therefore, the beads 14 formed on the lower portion of the base material layer 14 function to diffuse the light before converging the light incident from the outside to the structured pattern 12 of the triangular structure. For example, when the optical composite sheet 10 is applied to a backlight module, light emitted from the light guide plate 5 is diffused by the beads 14 without passing through the additional diffusion sheet 6.
上述珠子 14可设置于三角形结构化图形 12和基材层 11之间, 而除珠子 14 之外, 还可另外使用 2至 5 μ ιη大小的微粒子, 实现扩散功能。 The above-mentioned beads 14 may be disposed between the triangular structured pattern 12 and the substrate layer 11, and in addition to the beads 14, an additional particle size of 2 to 5 μm may be used to achieve a diffusion function.
但是, 由于现有光学复合片粒子相对结构化图形较大 (通常结构化图形 的预定间隔 50 μ ιη, 高度 25 μ ιη ) , 在将所述粒子置入结构化图形时难以均匀
排列, 而且, 若尝试结构变形, 则因雾度 (haze)提高及发生全透射率 (Total Transmission, TT)损失, 从而整体上降低通过光学复合片光的亮度。 However, since the existing optical composite sheet particles have a relatively large structural pattern (usually a predetermined interval of the structured pattern of 50 μm and a height of 25 μm), it is difficult to uniformly integrate the particles into the structured pattern. Arrangement, and if structural deformation is attempted, the haze is increased and the total transmission (TT) loss occurs, thereby reducing the brightness of the light passing through the optical composite sheet as a whole.
另外, 结构化图形层或珠子的抗划性能较弱, 因此, 在制造、 层叠组装 或运输过程中, 容易发生表面损伤, 因此, 表面瑕疵及产品不良率高。 即, 因用于基材层下部的珠子及微粒子以大约 2至 5 μ m的大小形成突出结构, 因此 在光学片的组装及制造过程中容易划伤, 而因其大小及突出结构的缺点, 导 致约 2 %左右的亮度损失。 In addition, the structural pattern layer or the bead has a weak scratch resistance. Therefore, surface damage is likely to occur during manufacturing, lamination, assembly, or transportation, and therefore, surface defects and product defective ratios are high. That is, since the beads and the fine particles used for the lower portion of the substrate layer are formed into a protruding structure by a size of about 2 to 5 μm, they are easily scratched during assembly and manufacturing of the optical sheet, and due to the size and the disadvantage of the protruding structure, This results in a loss of brightness of about 2%.
为解决上述问题, 己公开有几个旨在提高防划性的专利。 In order to solve the above problems, several patents have been disclosed for improving scratch resistance.
美国专利 US7 , 269, 328公开了用于提高亮度的光学棱镜薄膜, 而此专利 为防止划痕导致的损伤, 在基材层下部形成具有不同硬度系数的加强层。 该 现有技术只适用于普通的背光模块, 不适用于光学复合片, 因为光学复合片 基材层的两侧都有功能性涂层, 如果增加了加强层就会破坏原有涂层的功能 性。 An optical prism film for improving brightness is disclosed in U.S. Patent No. 7,269,328. This prior art is only applicable to ordinary backlight modules, and is not suitable for optical composite sheets, because the optical composite sheet substrate layer has functional coating on both sides, and if the reinforcing layer is added, the original coating function is destroyed. Sex.
美国专利公告 US2007/0121227A1所公开的技术, 将硅树脂的散射离子 ( scattering part icles ) 用在结构化图形内部, 散射粒子以 0. 5_30 μ m的大 小分布于结构化图形内部。 另外, 韩国专利注册第 10-0636739号所公开的技 术, 为提高硬度, 在形成微细结构化图形的紫外线硬化型树脂层内, 使用透 明的纳米粒子。 In the technique disclosed in U.S. Patent Publication No. US2007/0121227 A1, scattering particles of a silicone resin are used inside a structured pattern, and scattering particles are distributed inside the structured pattern at a size of 0.5 to 30 μm. Further, in the technique disclosed in Korean Patent Registration No. 10-0636739, in order to increase the hardness, transparent nanoparticles are used in the ultraviolet curable resin layer which forms a finely structured pattern.
但是, 上述两个现有技术只限于光学棱镜片或扩散片, 难应用于兼备聚 光功能和扩散功能的光学复合片, 而且在结构化图形成型过程中可能由于内 部的散射粒子的存在, 造成结构化图形表面不平整, 更加容易造成结构化图 形另一面的划伤和缺陷。 However, the above two prior art techniques are limited to an optical prism sheet or a diffusion sheet, and are difficult to be applied to an optical composite sheet having both a condensing function and a diffusion function, and may be caused by the presence of internal scattering particles in the structural pattern forming process. The structured graphic surface is not flat and is more likely to cause scratches and defects on the other side of the structured image.
发明内容 Summary of the invention
本发明的目的在于克服现有技术之不足, 提供一种用于背光模块的光学
复合片, 用于解决现有技术中光学复合片的防划性能不佳, 并且透射光的亮 度损失较大的问题。 The object of the present invention is to overcome the deficiencies of the prior art and provide an optical for a backlight module. The composite sheet is used to solve the problem that the optical composite sheet of the prior art has poor scratch resistance and large loss of brightness of transmitted light.
为了达到上述目的, 本发明提供一种用于背光模块的光学复合片, 该光 学复合片包括: 基材层, 由透光性材料构成; 多个结构化图形, 形成于上述 基材层上部并具有一预定间隔; 聚光层, 包括分布于所述结构化图形表面的 纳米粒子的表面涂层; 防划层, 在上述基材层下部, 利用含有纳米粒子的紫 外线硬化型胶粘剂涂布而成。 In order to achieve the above object, the present invention provides an optical composite sheet for a backlight module, the optical composite sheet comprising: a substrate layer composed of a light transmissive material; and a plurality of structured patterns formed on the upper portion of the substrate layer and Having a predetermined interval; a concentrating layer comprising a surface coating of nanoparticles distributed on the surface of the structured pattern; and a scratch-resistant layer coated on the lower portion of the substrate layer with an ultraviolet curable adhesive containing nanoparticles .
作为本发明实施例的再一个进一歩的方面, 所述表面涂层及所述防划层 的胶粘剂中包括以下至少一种纳米粒子: 包含 Si02、 Ti02, A1203或聚甲基丙烯 酸甲酯。 In still another aspect of the embodiments of the present invention, the surface coating layer and the anti-scratch layer adhesive include at least one of the following nanoparticles: comprising SiO 2 , Ti 0 2 , A1 2 0 3 or polymethyl Methyl acrylate.
作为本发明实施例的另一个进一歩的方面, 所述胶黏剂包括包含表面活 性剂的分散稳定剂。 As a further aspect of an embodiment of the present invention, the adhesive comprises a dispersion stabilizer comprising a surfactant.
作为本发明实施例的另一个进一歩的方面, 所述表面活性剂包括阳离子 系、 阴离子系、 非离子系或氟系。 As a further aspect of the embodiment of the present invention, the surfactant includes a cationic system, an anionic system, a nonionic system or a fluorine system.
作为本发明实施例的另一个进一歩的方面, 所述纳米粒子的粒径为 10至 1 OOnm;所述表面涂层厚度为 0. 01 μ m至 1 μ m;所述防划层厚度为 0. 1 μ m至 3 μ m。 As a further aspect of the present invention, the nanoparticle has a particle diameter of 10 to 100 nm; the surface coating thickness is 0.01 μm to 1 μm; 0. 1 μ m to 3 μ m.
另外, 所述聚光层为含有丙烯酸酯低聚合物 40-50重量份、 丙烯酸酯单体 45-55重量份、 光聚合引发剂 1-5重量份及添加剂 0. 01-2重量份的混合物经照 射紫外线并交联而成。 The mixture of 40-50 parts by weight of the acrylate oligomer, 45-55 parts by weight of the acrylate monomer, 1-5 parts by weight of the photopolymerization initiator, and 0. 01-2 parts by weight of the mixture. It is made by irradiating ultraviolet rays and crosslinking.
另外, 所述聚光层的结构化图形为以下结构之一, 剖面为重复的三角形 的圆筒状, 剖面为重复的三角形的金字塔状, 剖面为重复的半圆形的圆筒状, 剖面为重复的五角星的圆筒状, 剖面为重复的梯形的圆筒状或透镜状。 In addition, the structured pattern of the concentrating layer is one of the following structures, the cross section is a repeating triangular cylindrical shape, the cross section is a repeating triangular pyramid shape, and the cross section is a repeating semicircular cylindrical shape, and the cross section is The repeating pentagram is cylindrical and has a cylindrical or lenticular shape with a repeating trapezoidal shape.
本发明具备涂布纳米粒子的多层结构的背光模块用光学复合片, 通过含 有纳米粒子的表面涂层, 提高聚光层结构化图形的表面强度, 与此同时, 通 过扩散功能可隐蔽光学片的瑕疵, 提高基材层下部的扩散性能及抗划性能; 并且其利用纳米单位的涂层实现了用于扩散的突出结构, 降低所透射的光亮
度损失, 隐蔽或抵消暴露于结构化图形上部的瑕疵。 The present invention comprises an optical composite sheet for a backlight module coated with a multilayer structure of nanoparticles, which improves the surface strength of the structured pattern of the concentrating layer by a surface coating layer containing nanoparticles, and at the same time, conceals the optical sheet by a diffusion function瑕疵, improve the diffusion performance and scratch resistance of the lower part of the substrate layer; and it uses a nano-unit coating to achieve a protruding structure for diffusion, reducing the transmitted light Degree loss, concealing or offsetting defects that are exposed to the top of the structured graph.
另外, 本发明含有纳米粒子的防划层, 无需现有光学复合片中需单独具 备的保护片, 就可以达到提高抗划性能及维持亮度的目的, 而且通过纳米粒 子的微细分散涂布, 大大降低浸湿 et-out)现象及莫尔波纹 (Moire)现象, 从而兼备聚光及扩散功能的用于背光模块的光学复合片。 附图说明 In addition, the anti-scratching layer containing the nanoparticles of the present invention can achieve the purpose of improving the scratch resistance and maintaining the brightness without the need for a separate protective sheet in the conventional optical composite sheet, and is greatly dispersed by the fine dispersion of the nanoparticles. An optical composite sheet for a backlight module that has a phenomenon of reducing the wet-out et-out phenomenon and a Moire phenomenon, and having a collecting and diffusing function. DRAWINGS
此处所说明的附图用来提供对本发明的进一歩理解, 构成本申请的一部 分, 并不构成对本发明的限定。 在附图中: The drawings described herein are provided to provide a further understanding of the invention and are in no way of limitation. In the drawing:
图 1为现有技术中背光模块概略示意图; 1 is a schematic diagram of a backlight module in the prior art;
图 2为现有技术中光学复合片实施例剖面图; 2 is a cross-sectional view showing an embodiment of an optical composite sheet in the prior art;
图 3 为本发明实施例用于背光模块的涂布了纳米粒子的多层结构的光学 复合片结构图; 3 is a structural view of an optical composite sheet of a multilayer structure coated with nanoparticles for a backlight module according to an embodiment of the present invention;
图 4为图 3所示光学复合片的剖面图; Figure 4 is a cross-sectional view of the optical composite sheet of Figure 3;
图 5为制造本发明实施例表面涂层及防划层的工艺图; Figure 5 is a process diagram for fabricating a surface coating and an anti-scratch layer of an embodiment of the present invention;
图 6为设置本发明光学复合片的背光模块概略示意图。 Fig. 6 is a schematic view showing a backlight module in which an optical composite sheet of the present invention is provided.
附图符号 Figure symbol
1: 模架 4: 光源 1: formwork 4: light source
3: 光源反射板 5: 导光板 3: Light source reflector 5: Light guide
6: 扩散片 20: 光学复合片 6: Diffuser 20: Optical composite
22: 聚光层 25: 结构化图形 22: Concentrating layer 25: Structured graphics
7: 棱镜片 21: 基材层 7: prism sheet 21: substrate layer
23: 防划层 26: 表面涂层 具体实施方式 23: Anti-scratch layer 26: Surface coating Specific embodiment
为使本发明的目的、 技术方案和优点更加清楚, 下面结合附图对本发明
的具体实施例进行详细说明。 在此, 本发明的示意性实施例及其说明用于解 释本发明, 但并不作为对本发明的限定。 In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention will be described below with reference to the accompanying drawings. Specific embodiments are described in detail. The illustrative embodiments of the present invention and the description thereof are intended to explain the present invention, but are not intended to limit the invention.
图 3为本发明实施例具备纳米粒子涂布的用于背光模块的光学复合片概 略示意图; 图 4为图 3所示光学复合片的剖面图; 图 5为制造本发明一实施例表 面涂层及防划层的工艺图; 图 6为设置本发明光学复合片的背光模块概略示意 图。 3 is a schematic view of an optical composite sheet for a backlight module with nanoparticle coating according to an embodiment of the present invention; FIG. 4 is a cross-sectional view of the optical composite sheet of FIG. 3; and FIG. 5 is a surface coating for fabricating an embodiment of the present invention. And a process diagram of the anti-scratch layer; FIG. 6 is a schematic diagram of a backlight module in which the optical composite sheet of the present invention is disposed.
如图 3至图 4所示, 本发明光学复合片 20, 包括: 基材层 21、 聚光层 22、 防划层 23及上述聚光层 22的表面涂层 26。 As shown in FIG. 3 to FIG. 4, the optical composite sheet 20 of the present invention comprises: a substrate layer 21, a light collecting layer 22, an anti-scratching layer 23, and a surface coating layer 26 of the above-mentioned light collecting layer 22.
在本发明中, 上述聚光层 22在结构化图形 25的表面具备含有纳米粒子的 表面涂层 26, 该表面涂层26的厚度为0. 01 4 111-1 4 111。 In the present invention, the concentrating layer 22 has a surface coating layer 26 containing nanoparticles on the surface of the structuring pattern 25. The thickness of the surface coating layer 26 is 0.014 111-1 4 111.
上述表面涂层 26为胶黏剂树脂, 例如在紫外线硬化型胶黏剂中分散及含 有纳米粒子, 而上述纳米粒子可从包含 Si02、 Ti02、 A1203等氧化物或 PMMA中选 择一种或多种。 上述胶黏剂为了提高微粒的分散性, 还可包括包含阳离子系、 阴离子系、 非离子系、 氟系等表面活性剂的分散稳定剂, 较佳地, 包括光聚 合引发剂。 The surface coating layer 26 is an adhesive resin, for example, dispersed in an ultraviolet curing adhesive and containing nanoparticles, and the above nanoparticles can be selected from oxides or PMMA containing SiO 2 , Ti 2 2 , A 1 2 3 3 or the like. One or more. The above-mentioned adhesive may further include a dispersion stabilizer containing a surfactant such as a cationic system, an anionic system, a nonionic surfactant or a fluorine-based surfactant in order to improve the dispersibility of the fine particles, and preferably includes a photopolymerization initiator.
上述表面涂层 26的作用在于, 由于表面涂层 26的高硬度, 可以降低在结 构化图形 25尖端部 22a与其它部件发生的划伤。 The effect of the surface coating 26 described above is that the scratches on the tip end portion 22a of the structural pattern 25 and other members can be reduced due to the high hardness of the surface coating layer 26.
另外, 通过表面涂层 26的光遇到纳米粒子而发生散射(scattering) , 从 而可隐蔽或抵消因表面涂层里面的瑕疵(defect)所导致的暗点(dark spot)。 In addition, light that passes through the surface coating 26 encounters scattering of the nanoparticles, thereby concealing or counteracting dark spots caused by defects in the surface coating.
上述基材层 21由透光性材料制作而成, 较佳地, 包括由聚对苯二甲酸乙 二醇酯(PET)、 聚萘二甲酸乙二醇酯(PEN)、 聚乙烯(polyethylene)、 聚碳酸 酯(Polycarbonate)、 聚酯(Polyester)等制备而成的塑料薄膜, 但非限制。 The base material layer 21 is made of a light transmissive material, and preferably comprises polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyethylene (polyethylene). , plastic film prepared from polycarbonate (Polycarbonate), polyester (Polyester), etc., but not limited.
例如, 日本 T0Y0B0公司销售的 C0SM0SHINE薄膜、 T0RAY公司的 LUMILAR薄 膜等可用作上述基材层 21。 For example, a C0SM0SHINE film sold by Japan T0Y0B0 company, a LUMILAR film of T0RAY Co., and the like can be used as the above-mentioned base material layer 21.
聚光层 22的作用在于使通过基材层 21的光从层叠于其上部的显示部(未 图示)的正面出射, 形成于基材层 21上面, 包括平整的光入射面和形成有图形
的光出射面。 The light concentrating layer 22 functions to emit light passing through the base material layer 21 from the front surface of a display portion (not shown) laminated on the upper portion thereof, and is formed on the base material layer 21, including a flat light incident surface and a pattern formed thereon. The light exit surface.
聚光层 22在基材层 21上面, 包括形成向一个方向排列的多个棱镜的结构 化图形 25, 结构化图形 25的下面成为光入射面, 而结构化图形 25的上面成为 光出射面。 The concentrating layer 22 includes a structural pattern 25 on the substrate layer 21 which forms a plurality of prisms arranged in one direction. The lower surface of the structuring pattern 25 serves as a light incident surface, and the upper surface of the structuring pattern 25 serves as a light exit surface.
上述聚光层 22可由聚甲基丙烯酸甲酯(Poly-methyl methacrylate , PMMA) 等丙烯酸树脂或聚对苯二甲酸乙二醇酯(PET)树脂构成, 而较佳地, 由丙烯酸 酯低聚物 45至 55重量份、 丙烯酸酯单体 40至 55重量份、 光聚合引发剂 1至 5重 量份及添加剂 0. 01至 2重量份的混合物构成, 并向此混合物照射紫外线并交联 固化而成。 The concentrating layer 22 may be composed of an acrylic resin such as poly-methyl methacrylate (PMMA) or a polyethylene terephthalate (PET) resin, and preferably, an acrylate oligomer. From 45 to 55 parts by weight, 40 to 55 parts by weight of the acrylate monomer, 1 to 5 parts by weight of the photopolymerization initiator, and 0.1 to 2 parts by weight of the additive, and the mixture is irradiated with ultraviolet rays and cured by crosslinking. .
较佳地, 构成上述聚光层 22的混合物, 含有丙烯酸酯低聚物 45重量份、 丙烯酸酯单体 52重量份、 光引发剂 3重量份及添加剂 2重量份。 丙烯酸酯低聚 物选用聚氨酯丙烯酸酯低聚物为宜。 Preferably, the mixture constituting the light-concentrating layer 22 contains 45 parts by weight of an acrylate oligomer, 52 parts by weight of an acrylate monomer, 3 parts by weight of a photoinitiator, and 2 parts by weight of an additive. The acrylate oligomer is preferably a urethane acrylate oligomer.
丙烯酸酯单体起到反应性稀释剂或交联剂的作用。 光聚合引发剂作用在 于吸收光生成基团之后引发, 可从 α -醇酮( a -Hydroxyketone)、 苯基氧代乙 If (Phenylglyoxylate) A α—氣 H ( α -Aminoketone)中 禾中或多禾中。 The acrylate monomer functions as a reactive diluent or crosslinker. The photopolymerization initiator acts to absorb the photo-generating group, and can be derived from a-Hydroxyketone, Phenylglyoxylate A α-Ga H (α-Aminoketone) Wozhong.
另外, 添加剂可使用抑制聚合反应的抑制剂、 使表面变得均匀的表面平 滑剂、 抑制气泡发生的消泡剂等。 Further, as the additive, an inhibitor which suppresses the polymerization reaction, a surface smoothing agent which makes the surface uniform, an antifoaming agent which suppresses generation of bubbles, and the like can be used.
在此, 聚光层 22的结构化图形 25具备具有一定顶角(a )的尖端部 22a, 而 上述尖端部 22a可以预先设定的间隔 )排列。 Here, the structured pattern 25 of the light collecting layer 22 is provided with the tip end portions 22a having a certain vertex angle (a), and the tip end portions 22a are arranged at predetermined intervals.
上述光学复合片 20的结构化图形 25, 所述聚光层的结构化图形为以下结 构之一, 剖面为重复的三角形的圆筒状, 剖面为重复的三角形的金字塔状, 剖面为重复的半圆形的圆筒状, 剖面为重复的五角星的圆筒状, 剖面为重复 的梯形的圆筒状或透镜状。 。 In the structured pattern 25 of the optical composite sheet 20, the structured pattern of the light collecting layer is one of the following structures, the cross section is a repeating triangular cylindrical shape, the cross section is a repeating triangular pyramid shape, and the cross section is a repeating half. The circular cylindrical shape has a cylindrical shape with a repeating pentagram and a cylindrical or lenticular shape with a repeating trapezoidal shape. .
本发明防划层 23形成于上述结构化图形 25的另外一面即上述基材层 22下 部, 而且利用包含 10至 lOOnm大小纳米粒子 24的紫外线硬化型胶黏剂涂布成 0. Ι μ ιη至 3 μ ιη的厚度。 其中, 纳米粒子的粒径若超过上述范围, 则因受短波
长的影响而降低光线的遮蔽性, 从而降低亮度, 而若不足上述范围, 则因纳 米粒子 22b的表面能量的上升, 发生凝聚的问题。 The smear layer 23 is formed on the other side of the structuring pattern 25, that is, the lower portion of the substrate layer 22, and is coated with an ultraviolet curable adhesive containing 10 to 100 nm of the size of the nanoparticles 24. The thickness of 3 μ ιη. Wherein, if the particle diameter of the nanoparticles exceeds the above range, the short wave is affected The long influence reduces the shielding property of light, thereby lowering the brightness, and if it is less than the above range, the surface energy of the nanoparticle 22b rises and agglomeration occurs.
上述纳米粒子可从包含 Si02、 Ti02、 A1203等氧化物或 PMMA中选择。 The above nanoparticles may be selected from oxides or PMMA containing SiO 2 , Ti 2 2 , A 1 2 3 3 or the like.
上述防划层 23较之现有技术具有更高的硬度, 从而不仅具有防划功能, 而且由于内部包含的纳米粒子起到散射从外部入射的光的作用。 The above-mentioned anti-scratch layer 23 has higher hardness than the prior art, thereby not only having an anti-scratch function, but also functioning to scatter light incident from the outside due to the nanoparticles contained therein.
构成上述防划层 23的胶黏剂树脂为从聚碳酸酯(Polycarbonate , PC)、 聚 对苯二甲酸乙二醇酯(PET)、 聚丙烯酸酯(polyacrylate , PAR)、 聚氨酯丙烯 酸酯(urethaneacrylate)、 聚醚酰亚胺(polyetherimide , PEI)、 聚萘二甲酸 乙二酉享酉旨 (polyethyelenennapthalate , PEN)、聚苯硫醚 (polyphenylenesulf i de, PPS)、 聚芳酯(polyarylate)、 聚酰亚胺(polyimide)中选择的一种, 而 较佳地, 由聚氨酯丙烯酸酯制备而成。 The adhesive resin constituting the above-mentioned anti-scratching layer 23 is from polycarbonate (Polycarbonate, PC), polyethylene terephthalate (PET), polyacrylate (PAR), urethaneacrylate. Polyetherimide (PEI), polyethenelenennapthalate (PEN), polyphenylenesulfide (PPS), polyarylate (polyarylate), polyamido One selected from the group consisting of, preferably, a urethane acrylate.
另外, 在制造本发明背光模块用光学复合片 20时, 若在基材层 21下部形 成上述防划层 23, 较佳地, 含有纳米粒子的防划层 23可以在棱镜成型过程之 前制造, 而且需要对包含纳米粒子的胶黏剂内的溶剂进行干燥蒸发。 Further, in the production of the optical composite sheet 20 for a backlight module of the present invention, if the above-mentioned scratch-proof layer 23 is formed on the lower portion of the base material layer 21, preferably, the scratch-resistant layer 23 containing nanoparticles can be manufactured before the prism molding process, and It is necessary to dry and evaporate the solvent in the adhesive containing the nanoparticles.
上述表面涂层 26, 在棱镜成型过程之后制造为宜, 而且需要对包含纳米 粒子的胶黏剂内的溶剂进行干燥蒸发。 The above surface coating 26 is preferably produced after the prism forming process, and it is necessary to dry and evaporate the solvent in the adhesive containing the nanoparticles.
如图 5所示, 本发明光学复合片 20的防划层制造装置, 包括: 拉伸辊 30、 缠绕辊 40、 多个移送辊 41、 42、 51、 52、 纳米涂布模块 50、 干燥模块 60及紫 外线硬化模块 70。 上述拉伸辊 30拉伸基材层 21, 而上述缠绕辊 40缠绕涂布有 防划层 23的基材层 21。 上述多个移送辊 41、 42移送经干燥模块 60及紫外线硬 化模块 70完成防划层 23硬化的光学薄膜材料。 As shown in FIG. 5, the scratch-resistant layer manufacturing apparatus of the optical composite sheet 20 of the present invention comprises: a stretching roll 30, a winding roll 40, a plurality of transfer rolls 41, 42, 51, 52, a nano coating module 50, and a drying module. 60 and ultraviolet curing module 70. The stretching roll 30 stretches the base material layer 21, and the winding roll 40 is wound around the base material layer 21 coated with the scratch-resistant layer 23. The plurality of transfer rollers 41, 42 are transferred to the optical film material which is cured by the drying module 60 and the ultraviolet hardening module 70 to complete the scratch-resistant layer 23.
上述纳米涂布模块 50中包括包含 Si02、 Ti02、 A1203等纳米粒子的混合挥发 性溶剂的胶黏剂, 而上述溶剂包括甲醇、 乙醇、 n-丙醇、 ISO 丙醇、 n-丁醇 等醇类,而且还可包括甲基乙基酮(Methyl Ethyl Keton)、甲基异丁酮(Methyl Isobutyl Ketone , MIBK)等酮类。 The nano coating module 50 includes an adhesive containing a mixed volatile solvent of nanoparticles such as SiO 2 , Ti 2 2 , and A 1 2 3 3 , and the solvent includes methanol, ethanol, n-propanol, ISO propanol, and n. An alcohol such as butanol, and may also include ketones such as methyl ethyl ketone (Methyl Ethyl Keton) and methyl isobutyl ketone (Methyl Isobutyl Ketone, MIBK).
另外, 上述胶黏剂为了提高纳米粒子的分散性, 还可包括包含阳离子系、
阴离子系、 非离子系、 氟系等表面活性剂的分散稳定剂, 较佳地, 所述分散 稳定剂包括光聚合引发剂。 In addition, in order to improve the dispersibility of the nanoparticles, the above-mentioned adhesive may further include a cation system, A dispersion stabilizer of an anionic, nonionic, or fluorine-based surfactant, preferably, the dispersion stabilizer includes a photopolymerization initiator.
上述防划层 23经纳米涂布模块 50涂布之后, 经干燥模块 60及紫外线硬化 模块 70完成硬化, 被缠绕辊 40缠绕保管。 After the anti-scratching layer 23 is applied by the nano-coating module 50, it is hardened by the drying module 60 and the ultraviolet curing module 70, and is wound by the winding roller 40.
上述表面涂层 26通过上述纳米涂布模块 50、 干燥模块 60及紫外线硬化模 块 70制造成光学薄膜材料。 The surface coating layer 26 is formed into an optical film material by the nano coating module 50, the drying module 60, and the ultraviolet curing module 70 described above.
在本发明中, 在上述表面涂层 26及防划层 23上涂布所需纳米粒子分散稳 定剂的方法, 只要能够完成均匀涂布的方法即可, 没有特别的限制。 可利用 包括一般的凹板涂布法、 拉丝涂布法、 喷涂法、 微凹板涂布法、 狭缝涂布法 等在内的各种涂布方法。 另外, 可根据需要采用喷墨法等涂布法、 丝网印刷 等涂布方法。 In the present invention, a method of applying a desired nanoparticle dispersion stabilizer to the surface coating layer 26 and the scratch-preventing layer 23 is not particularly limited as long as a uniform coating method can be completed. Various coating methods including a general gravure coating method, a wire drawing method, a spray coating method, a micro gravure coating method, a slit coating method, and the like can be used. Further, a coating method such as a coating method such as an inkjet method or a screen printing method may be employed as needed.
另外, 虽然未图示, 在基材层 21下部涂布防划层 23之后, 制造结构化图 形 25及聚光层 22的方法与现有技术相同, 因此, 在此不再赘述。 Further, although not shown, after the anti-scratching layer 23 is applied to the lower portion of the base material layer 21, the method of manufacturing the structured pattern 25 and the light-concentrating layer 22 is the same as that of the prior art, and therefore, the description thereof will not be repeated.
下面, 结合图 6对设置本发明实施例具备涂布纳米粒子的多层结构的光学 复合片的背光模块进行说明。 Next, a backlight module in which an optical composite sheet having a multilayer structure coated with nanoparticles according to an embodiment of the present invention is provided will be described with reference to Fig. 6 .
本发明一实施例背光模块 80包括光学复合片 20, 该背光模块包括: 光源 84, 该光源 84邻近光源反射板 83设置, 并通过 LED等提供白色光; 导光板 85, 导引从上述光源 84出射的光; 反射板 82, 为防止从上述光源 84产生的光暴露 至外部而设置于上述导光板 85下部; 及光学复合片 20, 扩散及聚光从上述导 光板 85上部出射的光, 该光学复合片 20包括基材层 21、 聚光层 22、 防划层 23, 表面涂层 26, 结构化图形 25 (图中未示) 。 The backlight module 80 of the embodiment of the present invention includes an optical composite sheet 20, and the backlight module includes: a light source 84 disposed adjacent to the light source reflector 83 and providing white light through an LED or the like; and a light guide plate 85 guiding the light source 84 from the light source 84. The light emitted from the reflector 82 is provided on the lower portion of the light guide plate 85 to prevent light generated from the light source 84 from being exposed to the outside, and the optical composite sheet 20 diffuses and condenses light emitted from the upper portion of the light guide plate 85. The optical composite sheet 20 includes a substrate layer 21, a concentrating layer 22, a scratch-resistant layer 23, a surface coating 26, and a structured pattern 25 (not shown).
上述表面涂层 26在结构化图形 25的表面涂布成 0. 01 μ m至 1 μ m的厚度, 而 上述防划层 23厚度为 0. 1 μ m至 3 μ m, 该防划层 23由包含 10nm至 lOOnm大小纳米 粒子的紫外线硬化型胶黏剂构成。 该防划层 23的厚度若超过上述范围, 则存 在亮度降低, 不能满足显示装置轻薄性的问题, 而若不足上述范围, 则防划 层 23的防划效果较低。
本发明一实施例背光模块 80中, 通过 LED灯产生的白色光, 通过导光板 85 入射到防划层 23, 并通过防划层 23的纳米粒子扩散之后, 聚光至结构化图形 25, 然后被结构化图形的表面涂敷层 26再次扩散而同时实现聚光及扩散效果。 The surface layer 26 is coated on the surface of the structured pattern 25 to a thickness of 0.01 μm to 1 μm, and the thickness of the scratch-proof layer 23 is 0.1 μm to 3 μm. It is composed of an ultraviolet curable adhesive containing nanoparticles of 10 nm to 100 nm in size. When the thickness of the scratch-preventing layer 23 exceeds the above range, the brightness is lowered, and the problem of the slimness of the display device cannot be satisfied. If the thickness is less than the above range, the scratch-preventing effect of the scratch-preventing layer 23 is low. In the backlight module 80 of the embodiment, the white light generated by the LED lamp is incident on the anti-scratch layer 23 through the light guide plate 85, and is diffused by the nanoparticles of the anti-scratch layer 23, and then concentrated to the structured pattern 25, and then The surface coating layer 26 of the structured pattern is again diffused while achieving a concentrating and diffusing effect.
根据本发明一实施例, 因形成于基材层 21下部的防划层 23, 可去除原来 为防止异物的混入及防划需单独具备的保护片。 According to an embodiment of the present invention, the scratch-resistant layer 23 formed on the lower portion of the base material layer 21 can be removed from the protective sheet which is originally required to prevent the intrusion and the prevention of foreign matter.
综上而论, 本发明通过含有纳米粒子的表面涂层, 提高聚光层结构化图 形的表面强度, 与此同时, 通过纳米粒子的扩散功能可隐蔽光学片的瑕疵; 在结构化图形表面具有表面涂层, 可以避免现有技术中将微粒子加入结构化 图形内部影响结构化图形本身的透光率的不足。 In summary, the present invention enhances the surface strength of the structured layer of the concentrating layer by a surface coating containing nanoparticles, and at the same time, the enthalpy of the optical sheet can be concealed by the diffusion function of the nanoparticles; The surface coating can avoid the lack of light transmittance of the structured pattern itself by adding microparticles into the structured pattern in the prior art.
另外, 本发明含有纳米粒子的防划层, 无需现有光学复合片中需单独具 备的保护片, 即可达到提高抗划性能及维持亮度的目的, 而且通过纳米粒子 的微细分散涂布, 大大降低浸湿 et-out)现象及莫尔波纹 (Moire)现象。 In addition, the anti-scratching layer containing the nanoparticles of the present invention can achieve the purpose of improving the scratch resistance and maintaining the brightness without the need for a separate protective sheet in the existing optical composite sheet, and is greatly dispersed by the fine dispersion of the nanoparticles. Reduce the phenomenon of wetted out-out and Moire.
以上所述的具体实施例, 对本发明的目的、 技术方案和有益效果进行了 进一歩详细说明, 所应理解的是, 以上所述仅为本发明的具体实施例而已, 并不用于限定本发明的保护范围, 凡在本发明的精神和原则之内, 所做的任 何修改、 等同替换、 改进等, 均应包含在本发明的保护范围之内。
The specific embodiments of the present invention have been described in detail with reference to the preferred embodiments of the present invention. The scope of the invention, any modifications, equivalents, improvements, etc., made within the spirit and scope of the invention are intended to be included within the scope of the invention.